Late Wisconsinan Vegetation and Environment of the Tunica Hills Region, Louisiana/Mississippi

1994 ◽  
Vol 41 (3) ◽  
pp. 316-325 ◽  
Author(s):  
Stephen T. Jackson ◽  
Charles R. Givens
Keyword(s):  
Picea Glauca ◽  
Radiocarbon Dating ◽  
Juglans Nigra ◽  
Mississippi Valley ◽  
Fluvial Sediments ◽  
Minor Components ◽  
Radiocarbon Dates ◽  
The North ◽  
New Information ◽  
Late Wisconsinan

AbstractPollen, plant macrofossil, and radiocarbon-dating studies of seven exposures of fluvial sediments in the Tunica Hills region of southeastern Louisiana and southwestern Mississippi provide new information on late Wisconsinan vegetation, flora, and environment of the region. The assemblages date between 25,250 and 17,530 yr B.P. Pollen and macrofossil assemblages are dominated by Picea, which comprises 40-70% of the pollen assemblages. Abies and Larix pollen and macrofossils are absent, in contrast to sites to the north in the central Mississippi Valley. Deciduous hardwoods (Quercus, Fagus, Fraxinus, Carya, Juglans nigra, Acer, Ulmus) are minor components of both pollen and macrofossil assemblages. Radiocarbon dates of Picea and Quercus wood indicate that these two genera grew contemporaneously in the region. Regional upland forests were dominated by Picea. Picea cones and cone fragments are not typical of any extant North American species, and probably represent either an extinct species or an extinct variety or subspecies of Picea glauca. Late Wisconsinan climate of the region was cooler than present, but not necessarily as cool as implied by P. glauca or other "boreal" taxa.

The Late Wisconsinan Savanna Terrace in Tributaries to the Upper Mississippi River

1983 ◽  
Vol 20 (2) ◽  
pp. 165-176 ◽  
Author(s):  
Mark A. Flock
Keyword(s):  
Mississippi River ◽  
Large Scale ◽  
Lake Superior ◽  
Mississippi Valley ◽  
Red Clay ◽  
Radiocarbon Dates ◽  
Jackson County ◽  
Late Wisconsinan ◽  
Different Sources ◽  
Lacustrine Deposit

The Savanna Terrace, composed of alternating red and gray clayey sediments of late Wisconsinan age, can be found in five states along the upper Mississippi valley from Pepin County, Wisconsin, to Jackson County, Illinois. The terrace is the highest glaciofluvial-lacustrine deposit without a loess cover in the upper Mississippi valley. Chemical, physical, and mineralogical data show that two different sources provided sediment. The red clay is believed to have come from Lake Superior sources, while the gray clay is believed to have come from sources farther west. Large-scale flood events from glacial Lakes Agassiz, Grantsburg, and Superior were probably the main contributors of the sediments. The red clay in the terrace is similar in composition to red glaciolacustrine sediment found in eastern and northern Wisconsin. It also is mineralogically similar to the Hinckley Sandstone and the Fond du Lac Formation, which occur under and around Lake Superior. Radiocarbon dates obtained from the lower Illinois valley indicate that the terrace sediments were deposited sometime between about 13,100 and 9500 yr ago. Soils developed on the terrace are variable in their physical, chemical, and mineralogical properties, which reflect the composition of the clayey sediments.

An Archaeomagnetic Study of Hangi Stones in New Zealand

2021 ◽  
Author(s):  
◽  
Rimpy Kinger
Keyword(s):  
New Zealand ◽  
Radiocarbon Dating ◽  
Principal Component ◽  
Blocking Temperature ◽  
Radiocarbon Dates ◽  
The North ◽  
Sw Pacific ◽  
Archaeomagnetic Dating ◽  
Show Evidence ◽  
Temperature Spectra

<p>Burnt or fired archaeological artefacts often retain a record of the magnetic field in which they were last heated and cooled. Over the past four years we have collected oriented hangi stones from 10 archaeological sites spread across the North and South Islands of New Zealand. The stones vary in lithology from andesites, originating from the central North Island volcanoes, favoured by Maori for their durability and with remanent magnetization up to 30 A/m, to sandstones and schists from the main axial ranges, with magnetizations as weak as 10-4 A/m. Radiocarbon dating of charcoal fragments retrieved from amongst the stones indicates that the sites span from ca. 1400 AD to the present.  In all cases, we have independently oriented and retrieved several stones, and we have made several samples from each stone, either by drilling (standard cylindrical samples) or sawing (pseudo-cubes) in the laboratory. We have calculated site mean palaeomagnetic directions (Dec between 1.5o and 19.6o and Inc between -52.2o and -68.3o) from principal component analysis of thermal demagnetization and alternating field demagnetization data, discarding the data of stones that show evidence of disturbance after cooling. The directions are in good agreement with recently published palaeosecular variation records from lake sediments. We have carried out palaeointensity experiments using the Coe/Thellier method with pTRM and tail checks, and with selection criteria modified to the situation. Palaeointensities range from 50μT to 77μT. Rock magnetic experiments contribute to our understanding of the mineralogy, domain state and blocking temperature spectra.  We compare our data with predictions of the global field models ARCH3k and gufm1, and suggest that the addition of our new data will improve these models for the SW Pacific region for the most recent time period. Archaeomagnetic measurements are also used to date hangi sites by matching the palaeo-direction to an established archaeomagnetic dating model, NZPSV1k. Archaeomagnetic dating is used to resolve ambiguities in the calibration of radiocarbon dates, and shows up inconsistencies due to unreliable source material for radiocarbon dating. Archaeomagnetic dating and radiocarbon dating results are combined to give the best estimates of the best age of the hangi sites.</p>

An Archaeomagnetic Study of Hangi Stones in New Zealand

2021 ◽  
Author(s):  
◽  
Rimpy Kinger
Keyword(s):  
New Zealand ◽  
Radiocarbon Dating ◽  
Principal Component ◽  
Blocking Temperature ◽  
Radiocarbon Dates ◽  
The North ◽  
Sw Pacific ◽  
Archaeomagnetic Dating ◽  
Show Evidence ◽  
Temperature Spectra

<p>Burnt or fired archaeological artefacts often retain a record of the magnetic field in which they were last heated and cooled. Over the past four years we have collected oriented hangi stones from 10 archaeological sites spread across the North and South Islands of New Zealand. The stones vary in lithology from andesites, originating from the central North Island volcanoes, favoured by Maori for their durability and with remanent magnetization up to 30 A/m, to sandstones and schists from the main axial ranges, with magnetizations as weak as 10-4 A/m. Radiocarbon dating of charcoal fragments retrieved from amongst the stones indicates that the sites span from ca. 1400 AD to the present.  In all cases, we have independently oriented and retrieved several stones, and we have made several samples from each stone, either by drilling (standard cylindrical samples) or sawing (pseudo-cubes) in the laboratory. We have calculated site mean palaeomagnetic directions (Dec between 1.5o and 19.6o and Inc between -52.2o and -68.3o) from principal component analysis of thermal demagnetization and alternating field demagnetization data, discarding the data of stones that show evidence of disturbance after cooling. The directions are in good agreement with recently published palaeosecular variation records from lake sediments. We have carried out palaeointensity experiments using the Coe/Thellier method with pTRM and tail checks, and with selection criteria modified to the situation. Palaeointensities range from 50μT to 77μT. Rock magnetic experiments contribute to our understanding of the mineralogy, domain state and blocking temperature spectra.  We compare our data with predictions of the global field models ARCH3k and gufm1, and suggest that the addition of our new data will improve these models for the SW Pacific region for the most recent time period. Archaeomagnetic measurements are also used to date hangi sites by matching the palaeo-direction to an established archaeomagnetic dating model, NZPSV1k. Archaeomagnetic dating is used to resolve ambiguities in the calibration of radiocarbon dates, and shows up inconsistencies due to unreliable source material for radiocarbon dating. Archaeomagnetic dating and radiocarbon dating results are combined to give the best estimates of the best age of the hangi sites.</p>

The last glaciation of Marvin Peninsula, northern Ellesmere Island, High Arctic, Canada

1989 ◽  
Vol 26 (12) ◽  
pp. 2578-2590 ◽  
Author(s):  
Donald S. Lemmen
Keyword(s):  
High Arctic ◽  
Ellesmere Island ◽  
North Coast ◽  
Radiocarbon Dates ◽  
The North ◽  
Last Glaciation ◽  
Ice Retreat ◽  
Late Wisconsinan ◽  
Glaciomarine Sediments ◽  
North And South

The limit of the last glaciation on Marvin Peninsula, northernmost Ellesmere Island, is recorded by extensive ice-marginal landforms and early Holocene glaciomarine sediments. While glaciers occupied most valleys on the peninsula, other areas remained ice free, as did most of the adjacent fiords. Beyond the ice limit, sparse erratics and degraded meltwater channels within weathered bedrock are evidence of older, more extensive glaciation(s). Shorelines and marine shells 50 m above the limit of the Holocene sea along the north coast relate to these older glacial events.Thirty-four new radiocarbon dates provide a chronology of ice buildup and retreat. Glaciers reached their limit after 23 ka, and locally as late as 11 ka. This was achieved by both expansion of existing glaciers and accumulation on plateau and lowland sites, which are presently ice free. Late Wisconsinan climate was characterized by cold and extreme aridity. Five dates ranging from 11 to 31 ka BP on subfossil bryophytes suggest that ice-free areas were biologically productive throughout the last glaciation. Ice retreat and postglacial emergence had begun by 9.5 ka and was associated with a marked climatic amelioration. The deglacial chronology confirms a pronounced disparity in the timing of ice retreat on the north and south sides of the Grant Land Mountains.

scholarly journals THREE GENERATIONS UNDER ONE ROOF? BAYESIAN MODELING OF RADIOCARBON DATA FROM NUNALLEQ, YUKON-KUSKOKWIM DELTA, ALASKA

2018 ◽  
Vol 83 (3) ◽  
pp. 505-524 ◽  
Author(s):  
Paul M. Ledger ◽  
Véronique Forbes ◽  
Edouard Masson-Maclean ◽  
Charlotta Hillerdal ◽  
W. Derek Hamilton ◽  
...  
Keyword(s):  
High Resolution ◽  
Bayesian Modeling ◽  
Radiocarbon Dating ◽  
Archaeological Site ◽  
Radiocarbon Dates ◽  
Three Generations ◽  
The North ◽  
North American Arctic ◽  
Radiocarbon Data ◽  
Bayesian Statistical Modeling

This article presents the results of a program of radiocarbon dating and Bayesian modeling from the precontact Yup'ik site of Nunalleq (GDN-248) in subarctic southwestern Alaska. Nunalleq is deeply stratified, presenting a robust relative chronological framework of well-defined individual house floors abundant in ecofacts suitable for radiocarbon dating. Capitalizing on this potential, we present the results of one of the first applications of Bayesian statistical modeling of radiocarbon data from an archaeological site in the North American Arctic. Using these methods, we demonstrate that it is possible to generate robust, high-resolution chronological models from Arctic archaeology. Radiocarbon dates, procured prior to the program of dating and modeling presented here, suggested an approximately three-century duration of occupation at the site. The results of Bayesian modeling nuance this interpretation. While it is possible that there may have been activity for almost three centuries (beginning in the late fourteenth century), occupation of the dwelling complex, which dominates the site, was more likely to have endured for no more than a century. The results presented here suggest that the occupation of Nunalleq likely encompassed three generations beginning cal AD 1570–1630 before being curtailed by conflict around cal AD 1645–1675.

scholarly journals University of Waikato Radiocarbon Dates I

Radiocarbon ◽  
1987 ◽  
Vol 29 (2) ◽  
pp. 263-301 ◽  
Author(s):  
Alan G Hogg ◽  
David J Lowe ◽  
Chris H Hendy
Keyword(s):  
New Zealand ◽  
Radiocarbon Dating ◽  
Late Quaternary ◽  
Scintillation Counting ◽  
University Staff ◽  
Radiocarbon Dates ◽  
Postgraduate Students ◽  
The North ◽  
National University ◽  
Vacuum Systems

The radiocarbon dating laboratory at Waikato was established in 1975, primarily as a research tool in the fields of geomorphology, volcanology, tephrostratigraphy, coastal studies, and paleolimnology, to cope with the increasing supply of late Quaternary lake sediment, wood, peat, and shell samples submitted by University staff and postgraduate students undertaking research in the North Island of New Zealand. The method employed is scintillation counting of benzene using the procedures and vacuum systems designed by H A Polach for the Australian National University (ANU) Radiocarbon Dating Research Laboratory (Hogg, 1982). This date list reports on samples submitted by University of Waikato researchers and assayed in the Waikato laboratory mainly between 1979 and 1985. Other dates on material submitted by individuals working in other organizations in New Zealand, and overseas, are to be reported later.

scholarly journals Trial excavation of a terrace-edge enclosure at North Mains, Strathallan, Perthshire

1991 ◽  
Vol 120 ◽  
pp. 45-53
Author(s):  
Gordon J Barclay ◽  
Myra Tolan-Smith ◽  
Coralie Mills ◽  
J Barber
Keyword(s):  
Bronze Age ◽  
Radiocarbon Dating ◽  
Outer Edge ◽  
Early Bronze Age ◽  
Radiocarbon Dates ◽  
The North ◽  
First Millennium ◽  
First Millennium Bc

A small part of the terrace edge enclosure at North Mains was excavated to test the hypothesis that it was contemporary with one or other of the Neolithic/Early Bronze Age ceremonial monuments immediately to the north. Two cropmark ditches and an entrance through them were confirmed by excavation. The inner ditch was very steep sided; postholes were found on the inner edge of both ditches. Possible postholes were also noted on the outer edge of the outer ditch. Traces of a number of structures were located in the interior, including what may be the slight wall-trench of a circular house. The results of radiocarbon dating may suggest that the ditch was dug in the second millennium bc, while at least one of the structures in the interior was in use in the late first millennium bc. A comment on the radiocarbon dates is provided by John Barber (50--1). An appendix gives details of the `Identification of charcoal from North Mains' by Coralie Mills (52--3). Au

scholarly journals The Eneolithic Burial of Maksimovka I Soil Burial Ground from the Samara Trans-Volga Region

2019 ◽  
pp. 6-16
Author(s):  
Victor Tsibin ◽  
Anton Shalapinin
Keyword(s):  
Bronze Age ◽  
Volga Region ◽  
Burial Ground ◽  
Radiocarbon Dates ◽  
Soil Burial ◽  
North East ◽  
The North ◽  
New Information ◽  
Wide Range ◽  
Burial Grounds

Introduction. In the early 1980s the materials of soil burial grounds served as a base for identifying a special Eneolithic period in the history of the Middle and Lower Volga regions. Gathering of source basis on burial Eneolithic complexes is being effected rather slowly. Due to this fact the publication of new information on burial complexes of the Copper Age is quite urgent. This article enters the materials found during the excavations on Maksimovka I soil burial ground situated within the Samara river basin into scientific life. Methods. The collective burial on Maksimovka I burial ground consisted of three or probably four skeletons. They were supine, their legs bent at the knees and their heads oriented towards the North-East. Grave goods included a bone tool, a pressure tool, a sandstone pendant, flint scrapers and a borer, arrowheads with straight or emarginated foundation. Results. While comparing the burial rite with materials of other Eneolithic burial grounds one can see the greatest similarity in the complexes of the Khvalynsk Eneolithic culture (the presence of collective burials, supine position of skeletons with bent legs, orienting the buried people’s heads towards the North-East). Leaf-like arrowheads with narrowed bases and a cavity on the foundation were used in a wide range of activities in the Eneolithic period and Early Bronze Age in the Volga-Don interfluve. However they are typical for Caspian and Altatin complexes in the steppe area of the Volga region. Discussion. In accordance with the latest radiocarbon dates concerning the Eneolithic materials of soil burial grounds and settlement monuments one should date the burial on Maksimovka soil burial ground tentatively 5200–4500 BC.

Radiocarbon Ages from Two Submerged Strandline Features in the Western Gulf of Maine and a Sea-Level Curve for the Northeastern Massachusetts Coastal Region

1993 ◽  
Vol 40 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Robert N. Oldale ◽  
Steven M. Colman ◽  
Glen A. Jones
Keyword(s):  
Sea Level ◽  
Gulf Of Maine ◽  
Coastal Region ◽  
Sea Level Change ◽  
Level Curve ◽  
Radiocarbon Dates ◽  
Level Change ◽  
The North ◽  
Rapid Changes ◽  
Late Wisconsinan

AbstractNew radiocarbon dates provide ages for two submerged strandline features on the Massachusetts inner shelf. These ages provide limited control on a relative sea-level (RSL) curve for the late Wisconsinan and Holocene. The curve indicates a late Wisconsinan high stand of RSL of +33 m about 14,000 yr ago and a very short-lived relative low stand of about -43 m at about 12,000 yr ago followed by a rise to present sea level. Rapid changes of RSL around 12,000 yr ago may be related to changes in global glacial meltwater discharge and eustatic sea-level change shown by dated corals off Barbados. Variations in the magnitude and timing of RSL change from south to north along the coast of the western Gulf of Maine are due to greater crustal depression and later deglaciation to the north.

The Excavation of Duddo Stone Circle, Northumberland

2011 ◽  
Vol 77 ◽  
pp. 321-353
Author(s):  
Benjamin Edwards ◽  
Roger Miket ◽  
Rosie Bishop
Keyword(s):  
United Kingdom ◽  
Bronze Age ◽  
Radiocarbon Dating ◽  
Early Bronze Age ◽  
Radiocarbon Dates ◽  
North East ◽  
The North ◽  
The United Kingdom ◽  
North Eastern ◽  
Archaeobotanical Remains

This paper reports on the 2008 excavations at Duddo Stone Circle, Northumberland; the first excavation of a stone circle in the north-east of England under modern conditions. The project was successful in radiocarbon dating archaeobotanical material that suggests a date for construction at the beginning of the Early Bronze Age, and cremated human bone that dates its potential re-use for burial to around 1700 calbc. This report provides a stratigraphic account of the results of the excavation and specialist reports on the archaeobotanical remains, the radiocarbon dates, and the finds recovered. The discussion considers Duddo in the context of other stone circles in the North-East and Borders, and more generally across the United Kingdom, concluding that heterogeneity is a regional trait in north-eastern England and southern Scotland, much as architectural or landscape affinities link similar monuments in other regions.

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